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  1. #include <stdio.h>
  2.  
  3. int nextval() {
  4. 	return getchar() - '0';
  5. }
  6.  
  7. char nextop() {
  8. 	int c = getchar();
  9. 	if(c == '\n' || c == EOF)
  10. 		return '\0';
  11. 	else
  12. 		return (char) c;
  13. }
  14.  
  15. int calculate(int val1, char op, int val2, char op2) {
  16. 	if(op2 == '\0') { // 연산이 더 없는 경우
  17. 		if(op == '+') {
  18. 			return val1 + val2;
  19. 		} else if(op == '*') {
  20. 			return val1 * val2;
  21. 		}
  22. 	} else {
  23. 		int nval = nextval();
  24. 		char nop = nextop();
  25. 		if(op == '*') { // 순서대로 하면 되는 곱셈
  26. 			return calculate(val1 * val2, op2, nval, nop);
  27. 		} else if(op == '+' && op2 == '*') { // 두번째 연산자가 우선순위가 높은 경우
  28. 			return val1 + calculate(val2, op2, nval, nop);
  29. 		} else if(op == '+') { // 순서대로 하면 되는 덧셈
  30. 			return calculate(val1 + val2, op2, nval, nop);
  31. 		}
  32. 	}
  33. }
  34.  
  35. int main() {
  36. 	int val1 = nextval();
  37. 	char op1 = nextop();
  38. 	int val2 = nextval();
  39. 	char op2 = nextop();
  40. 	printf("Result: %d\n", calculate(val1, op1, val2, op2));
  41. 	return 0;
  42. }
Success #stdin #stdout 0s 3144KB
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1+2*3+5*7+9
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Result: 51
https://ideone.com/SEFwWU
language:
C++14 (gcc 8.3)
created:
11 years ago
visibility:
public

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